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At an elementary level, often, Japanese learners are taught that です is
equivalent to the verb "to be" in English. Typical example:

> 私は学生です, I am a student.

That's fine, after all, it works. And to be honest, most people probably
wouldn't really need a different explanation for the rest of their life.

With this question I'd like to go a little deeper. Can we really call です（or だ)
an auxiliary verb?

To start with, if you look だ up on
[goo](https://dictionary.goo.ne.jp/thsrs/17293/meaning/m0u/%E3%81%A0/), it is
grouped together with です, である, and のだ.

Right off the bat, you get this explanation:

> 断定を表わす。 expresses a conclusion/decision

So here is not really mentioning the word "verb" or "auxiliary verb" at all.
Shortly after you can see:

> 「です」は、「でございます」が変化したもの,

So, we can start by saying that actually です is an alteration/contraction of
でございます.

Continuing to read the definition we get:

> 「である」は、「で」に補助動詞「ある」が接続したもので、同様のものに「であります」「でございます」がある。

Hence, 「である」 is formed by attaching to「で」the subsidiary/auxiliary verb「ある」.
Because actually:

> 「で」は「だ」の連用形。 「で」is the conjunctive/continuative form of 「だ」

Therefore, if I'm not wrong, we can do the following passages:

> 「で」+「あります」＝「であります」＝ 「でございます」 ＝ 「です」

Does the above make sense? In particular I'm a bit doubtful about the second
equality.

To sum it up, 「です」 is a variation of 「だ」(its polite form). It is also a
contraction of 「でございます」, which in turn is the same as 「であります」(forgetting here
about the differences in usage), that is formed by attaching 「で」 to the
verb「あります」.

So, after this long trip, we arrive to the conclusion that the "hidden verb"
behind 「です」, is in fact
[ある](https://dictionary.goo.ne.jp/thsrs/15900/meaning/m0u/%E3%81%82%E3%82%8B/),
which is actually (or at least more close to) the sought after "to be".

Is this a correct explanation? How can it be improved? Or, if it's wrong,
where and why?


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grammar verbs copula
「です」, what is it really? Is my analysis correct?


Your collection of questions conflate a few things: 1) what is だ・です in modern
Japanese, and 2) how did だ・です derive historically.

Because of #2, #1 is a bit ... messy. :) So let's start with the history.

> 「です」は、「でございます」が変化したもの,

This isn't an explanation of what です is now, so much as an explanation of the
historical derivation. Shogakukan's 国語大辞典 provides this description:

> 「でござります」→「でござんす」→「であんす」→「でえす」→「です」の経路で生じたものという

Meanwhile, the modern plain form だ derives as:

> 「にてあり」から出た「である」が、〔dea〕→〔da〕と変化したものという。→であ・じゃ・である

Modern で (which actually appears from around the 1300s-1500s) is understood to
have evolved from earlier にて (which is still used in formal writing).
Classical copular ("is") verb あり equates to modern verb ある.

Looking now at the particular parts of your post:

> 「で」は「だ」の連用形。 「で」is the conjunctive/continuative form of 「だ」

Well, yes, in the modern language. But historically, だ derives from で + ある --
so this is not a regular kind of conjugation paradigm.

> To sum it up, 「です」 is a variation of 「だ」(its polite form).

Yes. Though I might not use the term "variation" so much as "polite form".

> It is also a contraction of 「でございます」,

It _derives_ from a contraction of でございます, but I don't believe it's considered
to be such a contraction in modern regular usage.

> which in turn is the same as 「であります」(forgetting here about the differences
> in usage)

It's not quite the same as であります. Note that ございます is the humble version of
あります. That difference in usage is important. :)

> that is formed by attaching 「で」 to the verb「あります」.

Yes -- but note also that であります is **not** a verb unto itself, but simply the
particle で plus the verb あります.

> So, after this long trip, we arrive to the conclusion that the "hidden verb"
> behind 「です」, is in fact ある, which is actually (or at least more close to)
> the sought after "to be".

Historically, yes. And if you dig around in classical Japanese and older
stages of the language, you'll find just that -- あり serves as the primary
copular verb.

In modern Japanese, however, だ・です is the primary copular verb: it closes a
predicate, and (optionally) supplies social register information
("politeness"). One no longer says things like 綺麗にあり, one says instead 綺麗だ.
Similarly, instead of 本にてあり, one says 本だ.

Related thread touching upon social register:

  * [Why can't だ be used after an I-adjective?](https://japanese.stackexchange.com/questions/43244/why-cant-%E3%81%A0-be-used-after-an-i-adjective)

I hope the above covers the bases for you. If not, please comment and I can
edit the post accordingly.

### Addendum

I missed a question of yours that I'd meant to answer.

> Can we really call です（or だ) an auxiliary verb?

Depends. :) "Auxiliary verb" (助動詞) is a kind of loose category in Japanese
school grammars. The [article on the Japanese
Wiktionary](https://ja.wikipedia.org/wiki/%E5%8A%A9%E5%8B%95%E8%A9%9E_\(%E5%9B%BD%E6%96%87%E6%B3%95\))
provides a table showing the various things that get this label. Some of them
I really don't agree with: そうだ and ようだ are listed here, and those are clearly
そう or よう + copular だ・です -- and だ・です is right there in the table as it's own
pair of rows at the bottom. Others like らしい, ない, and たい are adjectival in form
and function. Many, like させる or たがる, have full conjugation paradigms (i.e.
they have forms for all conjugation slots), whereas others like negative
supposition まい or positive supposition う are defective (i.e. have incomplete
conjugation paradigms; see [Defective
verb](https://en.wikipedia.org/wiki/Defective_verb) at Wikipedia).

Basically, it's a grab-bag of odds and ends that get stuck on the ends of
other things (often, but not always, verbs). This category was also previously
called simply 助け言葉 ("helping words"), and this vague moniker is a clue to the
vagueness of the category itself.

So, _"can we really call です（or だ) an auxiliary verb?"_ Sure. So long as we're
clear on what we mean by "auxiliary verb". :)


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The problem is that in modern Japanese “〜である” and it's many forms can do many
things it's elementary parts of “〜で" and “ある” cannot explain, the two are also
inseparable when used in this meaning which is very often the case when
adverbial forms of nouns are combined with other verbs, for instance, while
in: “ナイフで切る” we can separate them and in theory write “ナイフで昨日に切った” to say
“Yesterday I cut with a knife.” we cannot use “学生で昨日にあった” to mean “Yesterday I
was a student.” there are many other such inseparable constructs such as
“気をつける”, we can't say “気を本当につける” to mean “really watch out”, only “本当に気をつける”.
In fact, an interesting thing is that it's even “お気をつけください”, not “気をおつけください”,
which really shows how inseparable they are.

But the issue goes deeper, than that, you say that it simply means “to be” and
that most people would never need to think of it otherwise. I believe that
teaching students it means “to be” will very quickly require them to unlearn a
couple of things, such as that they might encounter sentences such as:

  * “読みたいです。”
  * “読むでしょう。”
  * “読みませんでした。”
  * “読まないとです。”
  * “ご主人様はそれをお読みですか。”
  * “私はですね、この本を読みたいんです。”
  * “本当に？私もですよ。” [as answer to the above]
  * “あの子にじゃなくて、あなたにあげる。”

None of these are hyper-rare, far-fetched examples and in all of them, seeing
“〜です”, or the last case the plain “〜だ” as “to be” makes no sense. Furthermore,
in most of these examples “〜で” alone without coupled with “〜ある” wouldn't ever
be grammatical, so what is actually going on here and what is “〜である” or “〜だ”
doing in modern Japanese?

## The simple theory that seems to fully describe “〜だ”'s function with no
exception.

What it is is simple: It's a clitic that is used to conjugate sentences that
end on a part of speech that can't conjugate itself to provide that specific
conjugation.

It's simply temping of it to think of it as “to be” because the two most
common completely nonconjugable parts sentences can end on, nouns and na/no-
adjectives typically, but not always, carry a semantics that would be
translated with “to be” in Japanese. But many other parts of speech also can't
conjugate in Japanese, or not fully. Even verbs can't fully conjugate on their
own to form the polite past negative form, they lack this conjugation so
“読みませんでした” has to step in and add “〜でした” to complete it. i-adjectives lack
their own polite forms completely so “読みたいです” has to step in. Things such as
“〜私も” don't conjugate at all, so “〜私もだよ” or “〜私もだった” have to step and in
modern Japanese the volitional form of active verbs has lost it's original
meaning of creating a supposition so “読むだろう” has to step in to provide that
because “読もう” simply means “Let's read.” not “He'll surely read.”.

Even with many na-adjectives it doesn't make much sense to think of it as “to
be” rather than simply a part of speech that conjugates the na-adjective. For
instance with “私はあなたを好きだ。”. Yes, I know that many traditional grammarists
would object to the use of “〜を” here but the reality is that Japanese people
use it nowadays, and not infrequently at all. Some would analyse “私はあなたが好きだ。”
as actually being “To me, you are loved.” to cling on to the idea that “〜だ”
means “to be” here but with “〜を”, which is used, this is really not possible
any more, “好き” simply functions as a verb here with a subject and an object
that means “to love”, there is no “to be”, but it can't conjugate on it's own,
so it needs “〜だ” to assist it and for instance become negative:

[![好き clearly used as a verb with an object using 〜じゃない to become negative.
\[熱ぞトラップ ch.
7\]](https://i.stack.imgur.com/t1Z1g.png)](https://i.stack.imgur.com/t1Z1g.png)

Essentially, if functions much the same as the now uncommon “〜を好かない” here. It
can't be justified to mean “to be”, it simply serves to make a na-adjective,
functioning as a verb, which are by the way called “descriptive verbs” in
Japanese, negative.

So no, I don't believe it can be called an “auxiliary verb” as much as an
“auxiliary conjugation”.


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To address some points raised:

(1)

Honorific language is a hodge-podge of verb forms and locutions used to show
respect. The fact that the polite past tense of the copula でした is used to
create the polite past tense of 読みません is just an accident of historical usage.
Originally there were other competing forms: -ませなんだ, -ませんかった, -ませんだった, in
addition to -ませんでした. The polite past tense form of the copula is being used
only to convey politeness, with no regard to its formal meaning as a copula.
One might compare the use of the causative form of the verb to indicate
extreme politeness that is common in classical Japanese. To try and force some
causative sense from it would be fruitless. And then there is the causative-
passive in classical Japanese...

Generally, the longer a locution, the more it is percieved as being polite.
This tendency is found in English (at least as spoken by British English
speakers) as well, 'Can you close the door please?', 'Would you be so kind as
to close the door please?', 'May I trouble you to close the door please?' etc.
English can't rely on many special verb forms unlike Japanese.

(2)

だ・です can be split, だ => である です => であります, and then additional material can be
inserted. One can say 昨日は学生ではあった・ありました, 'yesterday I was a student'. (There is
some kind of implied comparison here, 'yesterday I was a student [but
today...]', but the sentence can stand on its own, since context will make it
clear.) One can also say 昨日は学生でもあった・ありました 'yesterday I was also a student'.
Further examples:

だから中国は専制君主制の国家でながくありましたけれども・・・ 'Thus China was long a county under an absolute
ruler, but...

吃音{どもり}で、無口な暴君でわたくしがあれば・・・ 'If I were to be some stammering, speechless
tyrant...'

(3)

Since one can find many examples of acceptable Japanese such as

沖縄を本当に愛してくれるのなら

仕事を本当に早める

健康診断の結果を本当に理解していますか。

it would appear difficult to claim that 気を本当に付ける is not acceptable. There is a
syntactical operation in Japanese known as 'scrambling' (かき混ぜ操作) whereby
sentential constituents such as noun phrases, adverbial phrases, can be moved
from one position in the sentence to another. 本当に is an adverbial phrase, and
can be freely moved. Reasons for scrambling are probably to do with shifting
emphasis around in the sentence. An example:

a. 喫茶店の主人が元町商店街で犯人らしき男を見たそうだ。

b. 元町商店街で，喫茶店の主人が犯人らしき男を見たそうだ。

c. 犯人らしき男を，喫茶店の主人が元町商店街で見たそうだ。

d. 元町商店街で，犯人らしき男を，喫茶店の主人が見たそうだ。

a. is the normal, unmarked order of constituents. b., c., and d., show a
constituent moved to the front of the sentence, presumably to highlight that
constituent.

The case of 気を本当に付ける is thus nothing more than an example of the above
operation.

[Addendum]

I'd like to address another item where there seems to be further, terrible
confusion in regard to the use of です.

The following list of sentences, cited above, is suppose to show that treating
だ・です as the copula is misleading:

読みたいです。

読むでしょう。

読みませんでした。

読まないとです。

ご主人様はそれをお読みですか。

私はですね、この本を読みたいんです。

本当に？私もですよ。[as answer to the above]

あの子にじゃなくて、あなたにあげる。

As discussed earlier, the polite forms of the copula are used as a suppletive
device to form honorific forms of verbs which otherwise don't exist; thus,
there is no polite past tense form of the verb, so でした is added to the
negative of the non-past form, 読みませんでした to make a polite past tense. To think
of it as the copula here is a mistake. Similarly, でしょう is added to a non-past
(or past) tense verb to create a dubitative/tentative form, 読むでしょう, since 読もう,
as pointed out, is hortative, 'let's [do]'.

The case of お読みですか is somewhat different. This is the same as お読みになりますか, and
one can see that the copula is being substituted for the string になります. Here it
is reasonable to treat です as the copula; if one were to force a translation,
'is it your esteemed reading?'

In 私はですね, we have an example of one of the many ways of stating a topic in
Japanese. The sense overall is no different from 私は:

私はですね、この本を読みたいんです = 私はこの本を読みたいんです

A literal translation into English of course is unnatural, 'it is me [and]',
but that is the basic sense in Japanese.

Further, sentence ending のです means 'it is a case of', 'the explanation for
[something in context] is that', or the like. It is also often used when there
is a hint of reserve or hesitation, so it is commonly used with ーたい like this,
frequently also followed by が・けど:

その映画を見に行きたいんですが I would like to go and see that movie but [would you like to
come too?]

私もですよ demonstrates how です, as a copula, can be used as a substitute for a
constituent in the same, or a previous sentence:

私もですよ ＝ 私も[読みたいんです]よ 'it is me too [who wants to read it]'

In あの子にじゃなくて、あなたにあげる we have the same usage. Without substitution it would be

あの子にあげないで、あなたにあげる。

English is similar: 'I will give it to you, and not [give it to] her'.

読まないとです makes no sense as it stands. The only way to make sense of this syntax
is with some context like this:

お暇があると、それを買ってくれない？ 全然急ぎではないんで、お暇があるとですね。

If you have time, could you buy it for me? It's not at all urgent, so, [it's]
if you have time, OK?

And here, です is the copula.

The standard reference for anything to do with Japanese grammar is Samuel
Martin, A Reference Grammar of Japanese.


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